Fuel vapor leak check module

Details Fuel vapor leak check module Fuel vapor leak check module

2006-06-13

2006-06-13

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Simulating operating condition

Marine

C073S116070, C073S117020, C073S117020

Reexamination Certificate

active

07059177

ABSTRACT:
A fuel vapor leak check module has a pump for generating a pressure gradient between an inside and an outside of a fuel tank. The pump is driven by a motor which has driving shaft supported by a bearing. A lubricant is provided between the driving shaft and the bearing. When the pump is operated, a pressure gradient between a pump-side space and a motor-side space is generated whereby a lubricant is introduced from one of the pump-side space and the motor-side space to another, so that the introduced lubricant deteriorates the pump performance or motor performance. To avoid such a situation, communication passage is provided which communicates the motor-side space and the pump-side space. The inner pressure of the motor-side space becomes equal to that of the pump-side space.

REFERENCES:
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patent: 2002/0162457 (2002-11-01), Hyodo et al.
patent: A-10-90107 (1989-04-01), None
U.S. Appl. No. 10/911,555, filed Aug. 2004, Kobayashi et al.
U.S. Appl. No. 10/923,005, filed Aug. 2004, Tsuruta et al.
U.S. Appl. No. 10/923,786, filed Aug. 2004, Kano et al.
U.S. Appl. No. 10/922,999, filed Aug. 2004, Kobayashi et al.

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